Neural correlates of lexical and sublexical processes in reading

The purpose of the present study was to compare the brain regions and systems that subserve lexical and sublexical processes in reading. In order to do so, three types of tasks were used: (i). silent reading of very high frequency regular words (lexical task); (ii). silent reading of nonwords (sublexical task); and, (iii). silent reading of very low frequency regular words (sublexical task). All three conditions were contrasted with a visual/phonological baseline condition. The lexical condition engaged primarily an area at the border of the left angular and supramarginal gyri. Activation found in this region suggests that this area may be involved in mapping orthographic-to-phonological whole word representations. Both sublexical conditions elicited significantly greater activation in the left inferior prefrontal gyrus. This region is thought to be associated with sublexical processes in reading such as grapheme-to-phoneme conversion, phoneme assembly and underlying verbal working memory processes. Activation in the left IFG was also associated with left superior and middle temporal activation. These areas are thought to be functionally correlated with the left IFG and to contribute to a phonologically based form of reading. The results as a whole demonstrate that lexical and sublexical processes in reading activate different regions within a complex network of brain structures.     

Preattentive auditory context effects

The effects of auditory context on the preattentive and perceptual organization of tone sequences were investigated. Two sets of experiments were conducted in which the pitch of contextual tones was varied, bringing about two different contextual manipulations. Preattentive auditory organization was indexed by the mismatch negativity event-related potential, which is elicited by violations of auditory regularities even when participants ignore the sounds (e.g., by reading a book). The perceptual effects of the contextual manipulations on auditory grouping were assessed using target-detection and orderjudgment tasks. The close correspondence found between the effects of auditory context on the perceptual and preattentive measures of auditory grouping suggests that a large part of contextual processing is preattentive.     

Some problems for Gibbard's norm-expressivism

Conclusion I conclude that Gibbard fails to solve several of the traditional problems for expressivism. He solves some of these problems, but his solutions to them in effect give up expressivism. Of course, one might respond that it does not really matter whether his theory is expressivist. In some ways, I agree. Gibbard says many fascinating things about morality which have at most indirect connections to his expressivist analysis. I am thinking especially of his later discussions of hyperscepticism (180), parochialism (203 ff.), and indirect pragmatism (224). These views could still be developed even if he gave up expressivism. All I have tried to show here is that he does need to give up expressivism unless he can solve the problems that I have raised.     

Self-Transcendence,the True Self,and Self-Love

This essay presents a unified view of Bernard Lonergan's model of self-transcendence, Thomas Merton's notion of the true self, and Erich Fromm's meaning of self-love.     

Using microcomputer-based eeg to enable and encourage student-designed projects

Microcomputer-based electrophysiological recording systems enhance undergraduates’ understanding of neural activity and enable them to design independent research projects. The physiological psychology class at Alma College has employed BIOPAC Systems MP100 hardware with Acq-Knowledge software and Macintosh computers to record and analyze electroencephalograms (EEG). After examining progressive changes in brain waves during sleep, student researchers have proceeded to study the effects of a variety of factors such as caffeine, cognitive tasks, and prior experiences. The simplicity of the system allows undergraduates to concentrate on experimental design and data analysis rather than instrumentation.     

An analysis of perceptions from changes in optical size

The allocation of perceived size and perceived motion or displacement in depth resulting from retinal size changes (changes in the visual angle of the stimulus) was investigated in situations in which all other cues of perceived changes in distance were absent. The allocation process was represented by the size—distance invariance hypothesis (SDIH), in which, for a given change in visual angle, the perceived depth was determined only by the amount of size constancy available. The changes in perceived size and perceived distance (perceived depth) were measured by kinesthetic observer (open-loop) adjustments in five situations. These situations consisted of optical expansions or contractions presented successively or simultaneously or as a mixture of successive and simultaneous presentations. The amounts of perceived motion or perceived displacement in depth obtained by kinesthetic measures were compared with those obtained from size constancy measures as applied to the SDIH. This latter measure accounted for more of the perceived depth obtained from simultaneous and mixed situations than it did for the perceived depth from the successive situations and more for the perceived depth obtained from the expansion than from the contraction situations, whether these were simultaneous or mixed. Perceived rigidity of the stimulus (perfect size constancy) clearly was not obtained in any of the situations. Significant partial size constancy and some predictive ability of the perceived sagittal motion was found using the SDIH in all the situations except in the successively presented contraction situation, with the predictive ability from the SDIH increasing with increases in the amount of size constancy. The difference between the observer’s measures of the perceived motion or displacement in depth and the amount of perceived motion or displacement predicted from the perceptions of linear size using the SDIH is asserted to be due to a cognitive process associated with the perception of the different stimulus sizes as off-sized objects.     

“Operationalism” in psychotherapy: A possible means of putting a sorry state of theory in better order?

It will be shown in this paper that the study of the actual conduct of psychotherapy, at least in its classical form with a patient speaking his or her mind in any way the patient desires and a therapist helping the patient pursue those thoughts and wishes and conflicts and hopes for better luck in real life than before, is more conducive to agreement among rather different therapists, to clearer reasoning over psychotherapeutic interventions, and to more promising theoretical articulations than anything available in the theoretical texts of psychotherapy.